Software

Are you replacing the drives?

Or are you merely wanting to change a format on these drives?

And is this server's mirror maintained by a hardware array controller card?

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check this http://www.partition-tool.com/resource/how-to-resize-raid-1-without-data-loss.htm
If the "mirror" you mentioned is dynamic mirror volume, you cannot resize it directly

I have used a partition software to make this resizing work to be possible. I used <a href="http://www.extend-partition.com/partition-manager-server-edition.html">Aomei Partition Assistant Server Edition</a>.if you used it , you''ll be surprised that power. In a word , full-fledged .